During January 2025, bugbuster.cc focused on security hardening for the byrnHDF/hdf5 repository, addressing critical vulnerabilities in the HDF5 cache path. They implemented robust buffer overflow prevention in C, enhancing cache serialization and cache image header decoding by introducing buffer size checks to prevent reads beyond allocated memory. This work fixed two reported vulnerabilities, OSV-2024-390 and OSV-2023-77, by ensuring that cache handling routines did not copy or read past buffer boundaries. Their contributions improved the stability and security posture of the codebase, demonstrating depth in bug fixing, C programming, and security-focused engineering within a complex data management system.